When I attempt to promote a Windows Server to an AD DC + DNS server of the domain "testdom.com" or "testdom.local", I receive the message: The number of DNS servers registered as authoritative name servers for this domain could not be determined. Error: The filename, directory name, or volume label syntax is incorrect. If I do the same for "testing.testdom.com" or "internal.testdom.com", I do not receive this error.